How can several skype accounts be registered for one email?

Question

Skype

It was useful to recover the password to my Skype, and found that Skype knows two more accounts, in addition to mine, registered to the same email. Both seem to be virtual or even automatically created. In principle, Skype allows you to change the email in the settings to an arbitrary one, but then a letter about this is sent to the new mail ("Your email address for the "xx" account has been successfully changed"). I just didn't get any of those emails. Hence two questions:
1. what was it - some kind of naive attempt to hijack my skype or just bots registrate left accounts?
2. Why didn't I receive a letter in the mail that someone changed their mail to mine in their skype?

Answer 1

habrahabr.ru/post/158545 tried to hack you using a long-standing vulnerability

Answer 2

Why not ask Skype tech support about it? Perhaps you yourself once registered accounts on your email, and then forgot. And it is possible that someone tried to register an account on your email, but since it did not work (this, by the way, you need to check - suddenly your mailbox was hacked), although the accounts remained, they do not function. The technical support will have to write in English.